Starting with Merging Techniques, I Cautiously Become a Martial Saint

In the final years of the dynasty, bandits multiply and soldiers and brigands run rampant. To escape famine, the entire Jiang clan migrates to Jinzhou Prefecture, a place with everything yet to be rebuilt. The people of Jinzhou Prefecture are tough and fiercely devoted to martial arts. To put down roots as quickly as possible, the Jiang clan head orders every young person in the family to join one of the local Eight Martial Arts Schools and train. Jiang Ning'an transmigrates and becomes the Jiang family’s eldest legitimate son. Unfortunately, his constitution is terrible and he is frail and sickly, so he can only join the worst martial arts school and train in the lowest-grade cultivation technique. His future is bleak, and his status is at risk. Fortunately, he possesses a Heavenly Dao Seal Tome in his mind. Heaven rewards diligence, and all techniques return to the void! With the Heavenly Tome, Jiang Ning'an can cultivate any technique regardless of its bloodline or physique requirements, and he is guaranteed to master whatever he learns. His cultivation achievements are engraved on his soul as Dao Seals. Even if he loses his memory, has his cultivation crippled, or even loses his physical body, as long as his soul survives and the seals remain, his skill proficiency stays unchanged. When he starts cultivating again, his body automatically returns at an astonishing pace to the realm corresponding to his peak proficiency, as though muscle memory were etched into his soul. On top of that, the Heavenly Dao Seal Tome can merge cultivation techniques without any cost or loss. Even the most worthless techniques can be combined into divine arts. And so, Jiang Ning'an uses it to lie low through the chaos, help his family escape danger, and step by step reach the summit...